Well I've changed the caps. Now I'm listening the DaCapo ( with the 24 bit filter) and everything works fine, no white noise, but this means nothing because the noise wasn't always present.. I'll leave it on for a couple of days and then I'll see.....

John, am I right if I say that using the clock-lock dic without the clock cable, there are of low level cliks-clips-cliks.....?

I left the DaCapo hooked to a dvd/cd player ( optical link) in repeat mode all night long. This morning it was ok, no noise. Now I'm at work. I left it again on in repeat. I guess I'll leave it on for some day. I'll go home for lunch within an hour and I'll check it again.

The SAA7350 Bitstream outputs need to be re-formatted to "Return to Zero" Bitstream coding; otherwise you will have very poor THD+N due to "incorrect Pulse energy". Basically you need to logic "And" with the Master Clock - you also need to generate the Negative Data Pulse.

+ Pulse = Clock High & Data High
- Pulse = Clock High & Data Low

So you only can have a resultant Pulse (+ or -) if the clock is high - resulting in half pulse integration energy per clock cycle - but without "Edge Rise/ Fall time errors (If Balanced) & Missing Edge" distortion.

After Generating the 2 Phases from the Bitstream, you should then Latch to a Master clock 16.9344MHz, (in the case of the SAA7350 the Bitstream modulator is operating at half MCLK) - to resynchronise to MCLK and remove the Phase Noise (Jitter) from the SAA7350 outputs & subsequent Bitstream reformatting circuit. If you use a Dual D-FF with Q and Q-, then you can end up with 4 "Dac Elements" that can be finally summed.

The Bitstream outputs of the SAA 7350 are very heavily jittered - if you simply integrate its outputs directly you will hear all kind of "Birdies" due to its internal processing "Jittering" the outputs (typically heard as the Music ramps up and down in Level – such as the start of a track).

These 2 reclocked Output Phases need to be individually filtered then "differentially Summed" via an Opamp.

Firstly, the XSYS 2 is very heavily jittered by the internal clock tree of the 7350. In your current implantation (if it worked), the final pulse energy would be also modulated by the jitter on the output of XSYS2.

Other issues - I cannot see how it would work... I will forward you a Schematic in the next 24 hours...